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44 x 10 x 4
Lp = 1.760 cm²
Lp = 2π r (r+t)
Dengan d = 20 ⇒ r = 10
Lp = 2(22/7) 10 (10+18)
Lp = 44/7 x 10 x 28
Lp = 44 x 10 x 4
Lp = 1.760 cm²